It should be noted that the estimation of exposure levels results in a semi-quantitative variable rather than fully quantitative one, as illustrated with the example of methylene chloride exposure levels among mothers and 1,1,1-trichloroethane exposure levels among fathers in Supplementary Figure S1.

Over 100 different contaminants have been detected in Valley groundwater; the most common include trichloroethylene (TCE), a carcinogen, and 1,1,1-trichloroethane (TCA), which impairs the immune system and causes central nervous system depression.

In the past five years, Smith Fiberglass has achieved an estimated 95 percent reduction in total VOC (volatile organic compounds) emissions, an estimated 93 percent reduction in total 1,1,1-trichloroethane emissions and an estimated 74 percent reduction in methylene chloride emissions from its Little Rock facility.

The two lists also include many of the organic compounds typically found in waste oil, organic binders, sea coal and coke, such as acetone, benzene, 2,4-dimethylphenol, ethylbenzene, 1,1,1-trichloroethane, naphthalene, 2methylnapthalene, phenol, dimethyl phthalate, phenanthrene, tetrachloroethylene, toluene, cresols, and xylenes.

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